Vuthaluru H B
Department of Chemical Engineering, Curtin University of Technology, GPO Box 1987, Perth, WA 6845, Australia.
Bioresour Technol. 2004 Apr;92(2):187-95. doi: 10.1016/j.biortech.2003.08.008.
Investigations into the pyrolytic behaviour during co-pyrolysis of coal, biomass materials and coal/biomass blends prepared at different ratios (10:90, 20:80, 30:70 and 50:50) have been conducted using a thermogravimetric analysis (TGA) apparatus. The coal sample selected was Collie sub-bituminous coal from Western Australia, while wood waste (WW) and wheat straw (WS) were used as biomass samples. Three thermal events were identified during the pyrolysis. The first two were dominated by the biomass pyrolysis, while the third was linked to the coal pyrolysis, which occurred at much higher temperatures. No interactions were seen between the coal and biomass during co-pyrolysis. The pyrolytic characteristics of the blends followed those of the parent fuels in an additive manner. Among the tested blends, 20:80 blends showed the lowest activation energies of 90.9 and 78.7 kJmol(-1) for coal/WW and coal/WS blends respectively. The optimum blend ratio for pyrolysis of coal/WS was 50:50 with a high degradation rate in all the thermal events and a higher mass loss over the course of the co-pyrolysis compared to coal/WW blends examined. The reaction orders in these experiments were in the range of 0.21-1.60, thus having a significant effect on the overall reaction rate. Besides the pyrolysis of coal alone, the 50:50 coal/biomass blends had the highest reaction rate, ranging 1x10(9)-2x10(9) min(-1). The experimental results may provide useful data for power generation industries for the development of co-firing options with biomass.
利用热重分析仪（TGA）对不同比例（10:90、20:80、30:70和50:50）制备的煤、生物质材料以及煤/生物质混合物的共热解行为进行了研究。所选煤样为西澳大利亚的科利次烟煤，而木材废料（WW）和小麦秸秆（WS）用作生物质样品。热解过程中识别出三个热事件。前两个主要由生物质热解主导，而第三个与煤热解相关，煤热解发生在高得多的温度下。共热解过程中未观察到煤与生物质之间的相互作用。混合物的热解特性以加和方式遵循母体燃料的特性。在所测试的混合物中，20:80的煤/WW和煤/WS混合物分别显示出最低的活化能，为90.9和78.7 kJmol(-1)。煤/WS热解的最佳混合比例为50:50，在所有热事件中降解率高，且与所研究的煤/WW混合物相比，共热解过程中的质量损失更高。这些实验中的反应级数在0.21 - 1.60范围内，因此对总反应速率有显著影响。除了单独的煤热解外，50:50的煤/生物质混合物具有最高的反应速率，范围为1x10(9)-2x10(9) min(-1)。实验结果可为发电行业开发与生物质共燃选项提供有用数据。
